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Comparing libev/ev.c (file contents):
Revision 1.198 by root, Sun Dec 23 04:45:51 2007 UTC vs.
Revision 1.208 by root, Fri Feb 1 13:22:48 2008 UTC

1/* 1/*
2 * libev event processing core, watcher management 2 * libev event processing core, watcher management
3 * 3 *
4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007,2008 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved. 5 * All rights reserved.
6 * 6 *
7 * Redistribution and use in source and binary forms, with or without 7 * Redistribution and use in source and binary forms, with or without modifica-
8 * modification, are permitted provided that the following conditions are 8 * tion, are permitted provided that the following conditions are met:
9 * met: 9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
10 * 27 *
11 * * Redistributions of source code must retain the above copyright 28 * Alternatively, the contents of this file may be used under the terms of
12 * notice, this list of conditions and the following disclaimer. 29 * the GNU General Public License ("GPL") version 2 or any later version,
13 * 30 * in which case the provisions of the GPL are applicable instead of
14 * * Redistributions in binary form must reproduce the above 31 * the above. If you wish to allow the use of your version of this file
15 * copyright notice, this list of conditions and the following 32 * only under the terms of the GPL and not to allow others to use your
16 * disclaimer in the documentation and/or other materials provided 33 * version of this file under the BSD license, indicate your decision
17 * with the distribution. 34 * by deleting the provisions above and replace them with the notice
18 * 35 * and other provisions required by the GPL. If you do not delete the
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 36 * provisions above, a recipient may use your version of this file under
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 37 * either the BSD or the GPL.
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */ 38 */
31 39
32#ifdef __cplusplus 40#ifdef __cplusplus
33extern "C" { 41extern "C" {
34#endif 42#endif
… …
283typedef ev_watcher_time *WT; 291typedef ev_watcher_time *WT;
284 292
285#if EV_USE_MONOTONIC 293#if EV_USE_MONOTONIC
286/* sig_atomic_t is used to avoid per-thread variables or locking but still */ 294/* sig_atomic_t is used to avoid per-thread variables or locking but still */
287/* giving it a reasonably high chance of working on typical architetcures */ 295/* giving it a reasonably high chance of working on typical architetcures */
288static sig_atomic_t have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */ 296static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
289#endif 297#endif
290 298
291#ifdef _WIN32 299#ifdef _WIN32
292# include "ev_win32.c" 300# include "ev_win32.c"
293#endif 301#endif
… …
592 600
593#if EV_SELECT_IS_WINSOCKET 601#if EV_SELECT_IS_WINSOCKET
594 if (events) 602 if (events)
595 { 603 {
596 unsigned long argp; 604 unsigned long argp;
605 #ifdef EV_FD_TO_WIN32_HANDLE
606 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
607 #else
597 anfd->handle = _get_osfhandle (fd); 608 anfd->handle = _get_osfhandle (fd);
609 #endif
598 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0)); 610 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
599 } 611 }
600#endif 612#endif
601 613
602 { 614 {
… …
751/*****************************************************************************/ 763/*****************************************************************************/
752 764
753typedef struct 765typedef struct
754{ 766{
755 WL head; 767 WL head;
756 sig_atomic_t volatile gotsig; 768 EV_ATOMIC_T gotsig;
757} ANSIG; 769} ANSIG;
758 770
759static ANSIG *signals; 771static ANSIG *signals;
760static int signalmax; 772static int signalmax;
761 773
762static int sigpipe [2]; 774static EV_ATOMIC_T gotsig;
763static sig_atomic_t volatile gotsig;
764static ev_io sigev;
765 775
766void inline_size 776void inline_size
767signals_init (ANSIG *base, int count) 777signals_init (ANSIG *base, int count)
768{ 778{
769 while (count--) 779 while (count--)
… …
773 783
774 ++base; 784 ++base;
775 } 785 }
776} 786}
777 787
778static void 788/*****************************************************************************/
779sighandler (int signum)
780{
781#if _WIN32
782 signal (signum, sighandler);
783#endif
784
785 signals [signum - 1].gotsig = 1;
786
787 if (!gotsig)
788 {
789 int old_errno = errno;
790 gotsig = 1;
791 write (sigpipe [1], &signum, 1);
792 errno = old_errno;
793 }
794}
795
796void noinline
797ev_feed_signal_event (EV_P_ int signum)
798{
799 WL w;
800
801#if EV_MULTIPLICITY
802 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
803#endif
804
805 --signum;
806
807 if (signum < 0 || signum >= signalmax)
808 return;
809
810 signals [signum].gotsig = 0;
811
812 for (w = signals [signum].head; w; w = w->next)
813 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
814}
815
816static void
817sigcb (EV_P_ ev_io *iow, int revents)
818{
819 int signum;
820
821 read (sigpipe [0], &revents, 1);
822 gotsig = 0;
823
824 for (signum = signalmax; signum--; )
825 if (signals [signum].gotsig)
826 ev_feed_signal_event (EV_A_ signum + 1);
827}
828 789
829void inline_speed 790void inline_speed
830fd_intern (int fd) 791fd_intern (int fd)
831{ 792{
832#ifdef _WIN32 793#ifdef _WIN32
… …
837 fcntl (fd, F_SETFL, O_NONBLOCK); 798 fcntl (fd, F_SETFL, O_NONBLOCK);
838#endif 799#endif
839} 800}
840 801
841static void noinline 802static void noinline
842siginit (EV_P) 803evpipe_init (EV_P)
843{ 804{
805 if (!ev_is_active (&pipeev))
806 {
807 while (pipe (evpipe))
808 syserr ("(libev) error creating signal/async pipe");
809
844 fd_intern (sigpipe [0]); 810 fd_intern (evpipe [0]);
845 fd_intern (sigpipe [1]); 811 fd_intern (evpipe [1]);
846 812
847 ev_io_set (&sigev, sigpipe [0], EV_READ); 813 ev_io_set (&pipeev, evpipe [0], EV_READ);
848 ev_io_start (EV_A_ &sigev); 814 ev_io_start (EV_A_ &pipeev);
849 ev_unref (EV_A); /* child watcher should not keep loop alive */ 815 ev_unref (EV_A); /* child watcher should not keep loop alive */
816 }
817}
818
819void inline_size
820evpipe_write (EV_P_ int sig, int async)
821{
822 if (!(gotasync || gotsig))
823 {
824 int old_errno = errno;
825
826 if (sig) gotsig = 1;
827 if (async) gotasync = 1;
828
829 write (evpipe [1], &old_errno, 1);
830 errno = old_errno;
831 }
832}
833
834static void
835pipecb (EV_P_ ev_io *iow, int revents)
836{
837 {
838 int dummy;
839 read (evpipe [0], &dummy, 1);
840 }
841
842 if (gotsig)
843 {
844 int signum;
845 gotsig = 0;
846
847 for (signum = signalmax; signum--; )
848 if (signals [signum].gotsig)
849 ev_feed_signal_event (EV_A_ signum + 1);
850 }
851
852 if (gotasync)
853 {
854 int i;
855 gotasync = 0;
856
857 for (i = asynccnt; i--; )
858 if (asyncs [i]->sent)
859 {
860 asyncs [i]->sent = 0;
861 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
862 }
863 }
850} 864}
851 865
852/*****************************************************************************/ 866/*****************************************************************************/
853 867
868static void
869sighandler (int signum)
870{
871#if EV_MULTIPLICITY
872 struct ev_loop *loop = &default_loop_struct;
873#endif
874
875#if _WIN32
876 signal (signum, sighandler);
877#endif
878
879 signals [signum - 1].gotsig = 1;
880 evpipe_write (EV_A_ 1, 0);
881}
882
883void noinline
884ev_feed_signal_event (EV_P_ int signum)
885{
886 WL w;
887
888#if EV_MULTIPLICITY
889 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
890#endif
891
892 --signum;
893
894 if (signum < 0 || signum >= signalmax)
895 return;
896
897 signals [signum].gotsig = 0;
898
899 for (w = signals [signum].head; w; w = w->next)
900 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
901}
902
903/*****************************************************************************/
904
854static WL childs [EV_PID_HASHSIZE]; 905static WL childs [EV_PID_HASHSIZE];
855 906
856#ifndef _WIN32 907#ifndef _WIN32
857 908
858static ev_signal childev; 909static ev_signal childev;
910
911#ifndef WIFCONTINUED
912# define WIFCONTINUED(status) 0
913#endif
859 914
860void inline_speed 915void inline_speed
861child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status) 916child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
862{ 917{
863 ev_child *w; 918 ev_child *w;
919 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
864 920
865 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next) 921 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
922 {
866 if (w->pid == pid || !w->pid) 923 if ((w->pid == pid || !w->pid)
924 && (!traced || (w->flags & 1)))
867 { 925 {
868 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */ 926 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
869 w->rpid = pid; 927 w->rpid = pid;
870 w->rstatus = status; 928 w->rstatus = status;
871 ev_feed_event (EV_A_ (W)w, EV_CHILD); 929 ev_feed_event (EV_A_ (W)w, EV_CHILD);
872 } 930 }
931 }
873} 932}
874 933
875#ifndef WCONTINUED 934#ifndef WCONTINUED
876# define WCONTINUED 0 935# define WCONTINUED 0
877#endif 936#endif
… …
1064#endif 1123#endif
1065#if EV_USE_SELECT 1124#if EV_USE_SELECT
1066 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags); 1125 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1067#endif 1126#endif
1068 1127
1069 ev_init (&sigev, sigcb); 1128 ev_init (&pipeev, pipecb);
1070 ev_set_priority (&sigev, EV_MAXPRI); 1129 ev_set_priority (&pipeev, EV_MAXPRI);
1071 } 1130 }
1072} 1131}
1073 1132
1074static void noinline 1133static void noinline
1075loop_destroy (EV_P) 1134loop_destroy (EV_P)
1076{ 1135{
1077 int i; 1136 int i;
1137
1138 if (ev_is_active (&pipeev))
1139 {
1140 ev_ref (EV_A); /* signal watcher */
1141 ev_io_stop (EV_A_ &pipeev);
1142
1143 close (evpipe [0]); evpipe [0] = 0;
1144 close (evpipe [1]); evpipe [1] = 0;
1145 }
1078 1146
1079#if EV_USE_INOTIFY 1147#if EV_USE_INOTIFY
1080 if (fs_fd >= 0) 1148 if (fs_fd >= 0)
1081 close (fs_fd); 1149 close (fs_fd);
1082#endif 1150#endif
… …
1141#endif 1209#endif
1142#if EV_USE_INOTIFY 1210#if EV_USE_INOTIFY
1143 infy_fork (EV_A); 1211 infy_fork (EV_A);
1144#endif 1212#endif
1145 1213
1146 if (ev_is_active (&sigev)) 1214 if (ev_is_active (&pipeev))
1147 { 1215 {
1148 /* default loop */ 1216 /* this "locks" the handlers against writing to the pipe */
1217 gotsig = gotasync = 1;
1149 1218
1150 ev_ref (EV_A); 1219 ev_ref (EV_A);
1151 ev_io_stop (EV_A_ &sigev); 1220 ev_io_stop (EV_A_ &pipeev);
1152 close (sigpipe [0]); 1221 close (evpipe [0]);
1153 close (sigpipe [1]); 1222 close (evpipe [1]);
1154 1223
1155 while (pipe (sigpipe))
1156 syserr ("(libev) error creating pipe");
1157
1158 siginit (EV_A); 1224 evpipe_init (EV_A);
1225 /* now iterate over everything, in case we missed something */
1226 pipecb (EV_A_ &pipeev, EV_READ);
1159 } 1227 }
1160 1228
1161 postfork = 0; 1229 postfork = 0;
1162} 1230}
1163 1231
… …
1185} 1253}
1186 1254
1187void 1255void
1188ev_loop_fork (EV_P) 1256ev_loop_fork (EV_P)
1189{ 1257{
1190 postfork = 1; 1258 postfork = 1; /* must be in line with ev_default_fork */
1191} 1259}
1192 1260
1193#endif 1261#endif
1194 1262
1195#if EV_MULTIPLICITY 1263#if EV_MULTIPLICITY
… …
1198#else 1266#else
1199int 1267int
1200ev_default_loop (unsigned int flags) 1268ev_default_loop (unsigned int flags)
1201#endif 1269#endif
1202{ 1270{
1203 if (sigpipe [0] == sigpipe [1])
1204 if (pipe (sigpipe))
1205 return 0;
1206
1207 if (!ev_default_loop_ptr) 1271 if (!ev_default_loop_ptr)
1208 { 1272 {
1209#if EV_MULTIPLICITY 1273#if EV_MULTIPLICITY
1210 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct; 1274 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1211#else 1275#else
… …
1214 1278
1215 loop_init (EV_A_ flags); 1279 loop_init (EV_A_ flags);
1216 1280
1217 if (ev_backend (EV_A)) 1281 if (ev_backend (EV_A))
1218 { 1282 {
1219 siginit (EV_A);
1220
1221#ifndef _WIN32 1283#ifndef _WIN32
1222 ev_signal_init (&childev, childcb, SIGCHLD); 1284 ev_signal_init (&childev, childcb, SIGCHLD);
1223 ev_set_priority (&childev, EV_MAXPRI); 1285 ev_set_priority (&childev, EV_MAXPRI);
1224 ev_signal_start (EV_A_ &childev); 1286 ev_signal_start (EV_A_ &childev);
1225 ev_unref (EV_A); /* child watcher should not keep loop alive */ 1287 ev_unref (EV_A); /* child watcher should not keep loop alive */
… …
1242#ifndef _WIN32 1304#ifndef _WIN32
1243 ev_ref (EV_A); /* child watcher */ 1305 ev_ref (EV_A); /* child watcher */
1244 ev_signal_stop (EV_A_ &childev); 1306 ev_signal_stop (EV_A_ &childev);
1245#endif 1307#endif
1246 1308
1247 ev_ref (EV_A); /* signal watcher */
1248 ev_io_stop (EV_A_ &sigev);
1249
1250 close (sigpipe [0]); sigpipe [0] = 0;
1251 close (sigpipe [1]); sigpipe [1] = 0;
1252
1253 loop_destroy (EV_A); 1309 loop_destroy (EV_A);
1254} 1310}
1255 1311
1256void 1312void
1257ev_default_fork (void) 1313ev_default_fork (void)
… …
1259#if EV_MULTIPLICITY 1315#if EV_MULTIPLICITY
1260 struct ev_loop *loop = ev_default_loop_ptr; 1316 struct ev_loop *loop = ev_default_loop_ptr;
1261#endif 1317#endif
1262 1318
1263 if (backend) 1319 if (backend)
1264 postfork = 1; 1320 postfork = 1; /* must be in line with ev_loop_fork */
1265} 1321}
1266 1322
1267/*****************************************************************************/ 1323/*****************************************************************************/
1268 1324
1269void 1325void
… …
1843#endif 1899#endif
1844 if (expect_false (ev_is_active (w))) 1900 if (expect_false (ev_is_active (w)))
1845 return; 1901 return;
1846 1902
1847 assert (("ev_signal_start called with illegal signal number", w->signum > 0)); 1903 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1904
1905 evpipe_init (EV_A);
1848 1906
1849 { 1907 {
1850#ifndef _WIN32 1908#ifndef _WIN32
1851 sigset_t full, prev; 1909 sigset_t full, prev;
1852 sigfillset (&full); 1910 sigfillset (&full);
… …
2366 2424
2367 ev_stop (EV_A_ (W)w); 2425 ev_stop (EV_A_ (W)w);
2368} 2426}
2369#endif 2427#endif
2370 2428
2429#if EV_ASYNC_ENABLE
2430void
2431ev_async_start (EV_P_ ev_async *w)
2432{
2433 if (expect_false (ev_is_active (w)))
2434 return;
2435
2436 evpipe_init (EV_A);
2437
2438 ev_start (EV_A_ (W)w, ++asynccnt);
2439 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2440 asyncs [asynccnt - 1] = w;
2441}
2442
2443void
2444ev_async_stop (EV_P_ ev_async *w)
2445{
2446 clear_pending (EV_A_ (W)w);
2447 if (expect_false (!ev_is_active (w)))
2448 return;
2449
2450 {
2451 int active = ((W)w)->active;
2452 asyncs [active - 1] = asyncs [--asynccnt];
2453 ((W)asyncs [active - 1])->active = active;
2454 }
2455
2456 ev_stop (EV_A_ (W)w);
2457}
2458
2459void
2460ev_async_send (EV_P_ ev_async *w)
2461{
2462 w->sent = 1;
2463 evpipe_write (EV_A_ 0, 1);
2464}
2465#endif
2466
2371/*****************************************************************************/ 2467/*****************************************************************************/
2372 2468
2373struct ev_once 2469struct ev_once
2374{ 2470{
2375 ev_io io; 2471 ev_io io;

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